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      1 /*
      2  * Copyright (C) 2005 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #define LOG_TAG "StopWatch"
     18 
     19 #include <string.h>
     20 #include <stdlib.h>
     21 #include <stdio.h>
     22 
     23 #include <utils/Log.h>
     24 #include <utils/Errors.h>
     25 #include <utils/StopWatch.h>
     26 
     27 /*****************************************************************************/
     28 
     29 namespace android {
     30 
     31 
     32 StopWatch::StopWatch(const char *name, int clock, uint32_t flags)
     33     :   mName(name), mClock(clock), mFlags(flags)
     34 {
     35     reset();
     36 }
     37 
     38 StopWatch::~StopWatch()
     39 {
     40     nsecs_t elapsed = elapsedTime();
     41     const int n = mNumLaps;
     42     LOGD("StopWatch %s (us): %lld ", mName, ns2us(elapsed));
     43     for (int i=0 ; i<n ; i++) {
     44         const nsecs_t soFar = mLaps[i].soFar;
     45         const nsecs_t thisLap = mLaps[i].thisLap;
     46         LOGD(" [%d: %lld, %lld]", i, ns2us(soFar), ns2us(thisLap));
     47     }
     48 }
     49 
     50 const char* StopWatch::name() const
     51 {
     52     return mName;
     53 }
     54 
     55 nsecs_t StopWatch::lap()
     56 {
     57     nsecs_t elapsed = elapsedTime();
     58     if (mNumLaps >= 8) {
     59         elapsed = 0;
     60     } else {
     61         const int n = mNumLaps;
     62         mLaps[n].soFar   = elapsed;
     63         mLaps[n].thisLap = n ? (elapsed - mLaps[n-1].soFar) : elapsed;
     64         mNumLaps = n+1;
     65     }
     66     return elapsed;
     67 }
     68 
     69 nsecs_t StopWatch::elapsedTime() const
     70 {
     71     return systemTime(mClock) - mStartTime;
     72 }
     73 
     74 void StopWatch::reset()
     75 {
     76     mNumLaps = 0;
     77     mStartTime = systemTime(mClock);
     78 }
     79 
     80 
     81 /*****************************************************************************/
     82 
     83 }; // namespace android
     84 
     85